The Ultratech is Microtech Knives original dual action out-the-front knife. With over 40,000 units in circulation since 1999, the Ultratech is regarded as a leader in the industry. The Ultratech's spring remains in an "at rest" position at all times, except when deployed. The Ultra'tech's simplistic design, light weight, one handed action, slim shape, and scalpel sharp blade make it an exclusive every day carry knife. Most of the Ultratech double action OTF knives are made with CPM S35-VN (some older models may vary) and weigh 3.63 oz and come with a 3.4" blade. Overall open length is 8.48" Handle material is 6061-T6 and come in several blade options. Made in the USA. http://www.microtechknives.com/our-knives.php